n00b and Wiping 9900

I have purchased a BlackBerry Bold 9900 outright through Telstra (Australia).
I should receive the phone by Thursday and I would like to know a few things if anyone can help me.

I want to completely wipe the phone the minute I receive it (removing the entire OS) and flash the latest 7.1 leaked 7.1.0.267 from the CrackBerry OS page.

Can someone explain how to completelywipe and remove the current OS and flash the new leaked one from scratch?
Would I just use BBSAK and select Wipe, download the leaked OS and install, then LoadOS via BBSAK to flash the leaked OS?

Also, when I receive the phone do I need to set up BIS first or can I wipe/flash the phone then set it up?
I have called Telstra and had BIS enabled for my service already just so I am prepared for when I get the phone.

If you are new to BlackBerry I suggest that you should not wipe the phone. Instead just install the latest leak on the computer and load the OS using loader.exe. It will delete the old OS files and replace it with the new one.

Just make sure you install DM and BBSK, connect your phone and wipe through BBSK and install from the Loader which ever version of 7.1 you gonna have installed on your computer, its really simple since you dont have anything to backup and you can set up the BIS later
and by the way the leaked is a lot better and stable than their official